string(268) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%93%AA%E4%BA%9Bb2b%E7%BD%91%E7%AB%99%E6%95%88%E6%9E%9C%E6%AF%94%E8%BE%83%E5%A5%BD%E4%B8%80%E7%82%B9 => Failed to connect to 61.171.74.35 port 38041: Connection refused"
哪些b2b网站效果比较好一点
